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POErasing on UIImageView
 

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    <p>How can I erase content on front UIImage by swiping finger on it and display UIImage that is back side of UIView.</p> <p>I had used following code in <code>- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event</code> to erase front image:</p> <pre><code>-(void)eraseDrawingContents { UIGraphicsBeginImageContext(frontImage.frame.size); [frontImage.image drawInRect:CGRectMake(0, 0, frontImage.frame.size.width, frontImage.frame.size.height)]; CGContextSaveGState(UIGraphicsGetCurrentContext()); CGContextSetShouldAntialias(UIGraphicsGetCurrentContext(), YES); CGContextSetLineCap(UIGraphicsGetCurrentContext(), kCGLineCapRound); CGContextSetLineWidth(UIGraphicsGetCurrentContext(), 25.0); CGContextSetShadowWithColor(UIGraphicsGetCurrentContext(), CGSizeMake(0, 0), 50, [[UIColor whiteColor]CGColor]); CGMutablePathRef path = CGPathCreateMutable(); CGPathMoveToPoint(path, nil, lastPoint.x, lastPoint.y); CGPathAddLineToPoint(path, nil, currentPoint.x, currentPoint.y); CGContextSetBlendMode(UIGraphicsGetCurrentContext(), kCGBlendModeClear); CGContextAddPath(UIGraphicsGetCurrentContext(), path); CGContextStrokePath(UIGraphicsGetCurrentContext()); frontImage.image = UIGraphicsGetImageFromCurrentImageContext(); CGContextRestoreGState(UIGraphicsGetCurrentContext()); UIGraphicsEndImageContext(); lastPoint = currentPoint; } </code></pre> <p>I achieved following output.</p> <p><img src="https://i.stack.imgur.com/jZN85.png" alt="enter image description here"> </p> <p>But I need output like this.</p> <p><img src="https://i.stack.imgur.com/F0kEB.png" alt="enter image description here"></p> <p>How can we achieve this functionality?</p> <p>Please help me.</p>
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    1. USMehul Mistri
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    1. COholy ** how did you do this man? :O
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    2. COCheck answer of this question, i know that your case is different but may be in there, you will get hlepful ideas that apply in your case,, http://stackoverflow.com/questions/14107979/blur-an-image-of-specific-part-rectangular-circular and also http://stackoverflow.com/questions/14811126/erasing-part-of-an-image-that-overlaps-with-text-from-a-uilabel
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    3. COhttp://stackoverflow.com/questions/14053563/how-to-unerase-the-erased-uiimage i hope this will help you
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